I second this, to be honest it fits well with other great title released in 2004 but because so many great games came out that year, it didn't get enough spotlight. I played it years later and really, game was amazing.
For me I love Ridge Racer Type IV on PS1. Game is comedy handling, but the music is just perfection. Great driving song, I still listen to it while driving.
This one especially. one of the best driving song ever.
For my entry is this, it came out in one of the PS1 demo disk. Once I tried it I MUST BUY THIS GAME.
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Absolutely love this game, the gameplay, the music, the comedy. It didn't get a lot of attention from media or everyone (of course all goes to FFVII) but turn-based isn't my forte. I still playing this from time to time.
I can't recall any 'hidden gem' for PC games. I'll post them if I remember them.